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Solve the equation. (check the calculation with △ sign) 3x + 5x-4x = 1.6x-0.36x = 323.6x + 4.5X = 56.79x-0.4x = 25.8 △ 17.8x-12.4x = 1.08 △ 26.4x + 18x = 66.6
（1）3x+5x-4x=1.6， 4x÷4=1.6÷4， x=0.4；（2）x-0.36x=32， 0.64x÷0.64=32÷0.64， x=50；（3）3.6x+4.5x=56.7， 8.1x÷8.1=56.7÷8.1， x=7；（4）9x-0.4x=25.8， 8.6x÷8.6=25.8÷8.6， x=3；（5）17.8x-12.4x=1.08， The final calculation: the x = 0.2 is substituted into the original equation, left = 17.8 × 0.2-12.4 × 0.2-12.4 × 0.2 = 1.08, right = 1.08, right = 1.08, right = 1.08, because left = right, because left = right, so x = 0.2 is the solution of the original equation because x = 0.2 is the solution of the original equation because the left = right, so x = 0.2 is the solution of the original equation. (6) 26.4x + 18x = 66.6 (6) 26.4x26.4x + 18x = 66.6, (6) 26.4x26.4x + 18x = 66.6, & amp & amp & nbsp; & nbsp; & nbsp; & nbsp & nbsp; the & nbsp & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 44; 44.4x44; 44.4x44.4x44-44.4x44-44.4x44-44.4x44-44.4x44.4x44.4xnbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; &Check: substitute x = 1.5 into the original equation, left = 26.4 × 1.5 + 18 × 1.5 = 66.6, right = 66.6, because left = right, so x = 1.5 is the solution of the original equation
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