3x + 13 = 61 - 3x : add 3x to both sides
6x + 13 = 61 : deduct 13 from both sides
6x = 48 : divide both sides by 6
x = 8
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In the equation 3x plus 7 equals 13, x is equal to 2.
3+3x+7x=13 3x+7x=10 10x=10 x=1
x=4
3x+7=5x-13 ----> 3x-5x=-13-7 ----> -2x=-6 -----> x=3
y = (13 - 3x)/2 and that cannot be simplified further.